/Engine/Source/Runtime/Engine/Classes/Kismet/KismetMathLibrary.h
Gets a normalized unit copy of the vector, ensuring it is safe to do so based on the length. The W element is ignored and the returned vector has W=0. Returns zero vector if vector length is too small to safely normalize.
A normalized copy if safe, (0,0,0) otherwise.
static FVector4 Vector4_Normal3 ( const FVector4 & A, float Tolerance )